CVE-2026-43937

YAF.NET: Pre-Handler Authorization Bypass on Admin Pages Enabling Blind SQL Execution via `/Admin/RunSql`

State: Published
Severity: 8.8 High
Published: May 12, 2026
Updated: May 12, 2026
Reserved: May 4, 2026

Description

YetAnotherForum.NET (YAF.NET) is a C# ASP.NET forum. Prior to 4.0.5, Any admin OnPost… handler executes its side effects before the ResultFilterAttribute rewrites the response to a 302 to /Info/4. The most impactful abuse is /Admin/RunSql, whose OnPostRunQuery binds Editor from the POST body and passes it straight to IDbAccess.RunSql with no caller check, yielding arbitrary SQL execution for any low-privileged user. This vulnerability is fixed in 4.0.5.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-89 Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CWE-841 Improper Enforcement of Behavioral Workflow

Affected Products

Product	Versions
YAFNETYAFNET	< 4.0.5Affected

References

https://github.com/YAFNET/YAFNET/security/advisories/GHSA-xhw7-j96h-c3g5

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